I would not crate your dog for 9 hours during the day. It is healthier for both animals and humans to maintain regular intake and elimination of water. Better for the kidneys and entire system.
I would try an xpen inside around the doggie door to the outdoor area where you have the potty patch. Limit his freedom and still give access to potty.
Second, I would consider the potty patch may be turning him off. My boys love a fresh pad and will let me know when they think their piddle pad needs to be changed. Make sure you keep the potty patch adequately cleaned.
Good luck.
__________________ Kristin, Max and Teddy
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